Display device and method for manufacturing thereof

• US 8,450,925 B2
• Filed: 08/15/2011
• Issued: 05/28/2013
• Est. Priority Date: 01/25/2002
• Status: Expired due to Term

• Current Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Original Assignee: Semiconductor Energy Laboratory Co., Ltd.
• Inventors: Seo, Satoshi, Yamazaki, Shunpei
• Primary Examiner(s): Patel, Vip
• Application Number:
  US13/209,717
• Publication Number:
  US 20120205631A1
• Time in Patent Office: 652 Days
• Field of Search: 313/498, 313/504, 313/506, 313/509, 313/512
• US Class Current: 313/504
• CPC Class Codes: H05B 33/10 Apparatus or processes specially adapted to the manufacture of electroluminescent light sources
• CPC Class Codes: H10K 50/155 comprising dopants
• CPC Class Codes: H10K 50/165 comprising dopants
• CPC Class Codes: H10K 50/17 Carrier injection layers
• CPC Class Codes: H10K 50/805 Electrodes
• CPC Class Codes: H10K 59/00 Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
• CPC Class Codes: H10K 59/122 Pixel-defining structures or layers, e.g. banks
• CPC Class Codes: H10K 59/173 comprising banks or shadow masks

Abstract

It is a problem to provide an electric apparatus less in consumption power and long in life by the manufacture using the display device. An insulating bank is provided in a form surrounding the pixel portions on first electrodes over a substrate. The entire surface is applied, by a wet scheme (method), with an organic conductive film which has a thickness form of T2>T1>T3 under the influence of the insulating bank. Accordingly, the portion T3 has an increased resistance in a lateral direction, making possible to prevent against crosstalk. Due to a conductive polymer as a buffer layer, a display device can be provided which is low in drive voltage. Furthermore, because the portion T2 is increased in thickness, the electric-field concentration is relaxed at and around the pixel portion. This makes it possible to prevent the organic light-emitting element from deteriorating at around the pixel.

Claims

1. A light emitting device comprising:

a substrate;

a first electrode over the substrate;

an insulating bank having an opening overlapping with the first electrode, the insulating bank over the substrate and partly overlapping with the first electrode;

an organic conductive film comprising an organic semiconductor and an accepter, the organic conductive film over the first electrode and on at least a top surface of the insulating bank;

an organic thin film comprising an organic compound capable of causing electroluminescence, the organic thin film over the insulating bank and the organic conductive film; and

a second electrode over the organic thin film,

wherein the organic conductive film on a part of a surface of a tapered portion of the insulating bank has a first thickness,

wherein the organic conductive film in a vicinity of a center of the opening has a second thickness, and

wherein the second thickness is thicker than the first thickness.

2. The light emitting device according to claim 1, wherein the organic conductive film has a conductivity of 10⁻

6 S/cm or higher and 10<sup>−

2</sup> S/cm or lower.

3. The light emitting device according to claim 1, wherein the light emitting device is an active matrix display device.

4. The light emitting device according to claim 1, wherein the light emitting device is a passive matrix display device.

5. A light emitting device comprising:

a substrate;

a first electrode over the substrate;

an insulating bank having an opening overlapping with the first electrode, the insulating bank over the substrate and partly overlapping with the first electrode;

an organic conductive film comprising an organic semiconductor and a donor, the organic conductive film over the first electrode and on at least a top surface of the insulating bank;

an organic thin film comprising an organic compound capable of causing electroluminescence, the organic thin film over the insulating bank and the organic conductive film; and

a second electrode over the organic thin film,

wherein the organic conductive film on a part of a surface of a tapered portion of the insulating bank has a first thickness,

wherein the organic conductive film in a vicinity of a center of the opening has a second thickness, and

wherein the second thickness is thicker than the first thickness.

6. The light emitting device according to claim 5, wherein the organic conductive film has a conductivity of 10⁻

6 S/cm or higher and 10<sup>−

2</sup> S/cm or lower.

7. The light emitting device according to claim 5, wherein the light emitting device is an active matrix display device.

8. The light emitting device according to claim 5, wherein the light emitting device is a passive matrix display device.

9. A light emitting device comprising:

a substrate;

a first electrode over the substrate;

an insulating bank having an opening overlapping with the first electrode, the insulating bank over the substrate and partly overlapping with the first electrode;

an organic conductive film covering a surface of the insulating bank and over the first electrode;

an organic thin film comprising an organic compound capable of causing electroluminescence, the organic thin film over the insulating bank and the organic conductive film; and

a second electrode over the organic thin film,

wherein the organic conductive film on a part of a surface of a tapered portion of the insulating bank has a first thickness,

wherein the organic conductive film in a vicinity of a center of the opening has a second thickness, and

wherein the second thickness is thicker than the first thickness.

10. The light emitting device according to claim 9, wherein the organic conductive film is a conductive polymer film.

11. The light emitting device according to claim 9, wherein the organic conductive film is a polymer having π

-conjugated system added with an acceptor or a donor.

12. The light emitting device according to claim 11, wherein the polymer having π

-conjugated system added with the acceptor or the donor is at least one selected from group consisting of PEDOT/PSS and PAni/PSS.

13. The light emitting device according to claim 9, wherein the organic conductive film has a conductivity of 10⁻

6 S/cm or higher and 10<sup>−

2</sup> S/cm or lower.

14. The light emitting device according to claim 9, wherein the light emitting device is an active matrix display device.

15. The light emitting device according to claim 9, wherein the light emitting device is a passive matrix display device.

16. A light emitting device comprising:

a substrate;

a first electrode over the substrate;

a second electrode over the substrate;

an insulating bank having a first opening overlapping with the first electrode and a second opening overlapping with the second electrode, the insulating bank over the substrate and partly overlapping with the first electrode and the second electrode;

an organic conductive film over the insulating bank, the first electrode, and the second electrode;

an organic thin film comprising an organic compound capable of causing electroluminescence, the organic thin film over the first electrode, the second electrode, the insulating bank, and the organic conductive film;

wherein the organic conductive film on a part of a surface of a tapered portion of the insulating bank has a first thickness,

wherein the organic conductive film in a vicinity of a center of the first opening has a second thickness, and

wherein the second thickness is thicker than the first thickness.

17. The light emitting device according to claim 16, wherein the organic conductive film comprises an organic semiconductor and an accepter.

18. The light emitting device according to claim 16, wherein the organic conductive film comprises a low-molecular an organic semiconductor and a donor.

19. The light emitting device according to claim 16, wherein the organic conductive film is a conductive polymer film.

20. The light emitting device according to claim 16, wherein the organic conductive film is a polymer having n-conjugated system added with an acceptor or a donor.

21. The light emitting device according to claim 20, wherein the polymer having π

-conjugated system added with the acceptor or the donor is at least one selected from group consisting of PEDOT/PSS and PAni/PSS.

22. The light emitting device according to claim 16, wherein the organic conductive film has a conductivity of 10⁻

6 S/cm or higher and 10<sup>−

2</sup> S/cm or lower.

23. The light emitting device according to claim 16, wherein the light emitting device is an active matrix display device.

24. The light emitting device according to claim 16, wherein the light emitting device is a passive matrix display device.